1-Gb/s 80-dBΩ fully differential CMOS transimpedance amplifier in multichip on oxide technology for optical interconnects

University of Ulsan, Ulsan, Ulsan, South Korea
IEEE Journal of Solid-State Circuits (Impact Factor: 3.01). 07/2004; 39(6):971 - 974. DOI: 10.1109/JSSC.2004.827795
Source: IEEE Xplore


A 1-Gb/s differential transimpedance amplifier (TIA) is realized in a 0.25-μm standard CMOS technology, incorporating the regulated cascode input configuration. The TIA chip is then integrated with a p-i-n photodiode on an oxidized phosphorous-silicon (OPS) substrate by employing the multichip-on-oxide (MCO) technology. The MCO TIA demonstrates 80-dBΩ transimpedance gain, 670-MHz bandwidth for 1-pF photodiode capacitance, 0.54-μA average input noise current, -17-dBm sensitivity for 10-12 bit-error rate (BER), and 27-mW power dissipation from a single 2.5-V supply. It also shows negligible switching noise effect from an embedded VCO on the OPS substrate. Furthermore, a four-channel MCO TIA array is implemented for optical interconnects, resulting in less than -40-dB crosstalk between adjacent channels.

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    • "Therefore, regulated cascade (RGC) configuration is exploited to solve this problem. [1] RGC configuration not only enhances bandwidth, but also reduces the highfrequency noise contribution relating with the large input parasitic capacitance. This paper modifies the later circuit of RGC input configuration in the foundation of [2] and [3]. "

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    ABSTRACT: In this work, a 10 Gb/s CMOS optical receiver using the modified regulated cascade scheme is developed based on the TSMC 0.18 mum CMOS technology. The proposed receiver includes a transimpedance amplifier, limiting amplifier, open-drain output buffer and offset cancellation unit. By using the feedback oscillation technique, the overall optical receiver can compensate input capacitances of the photodiode and bonding pad. Our transimpedance amplifier has a bandwidth more than 6.3GHz at a transimpedance gain of 800 Omega and the maximum allowed input capacitance of 300 fF. The limiting amplifier using the feedback oscillation, active inductor peaking, and Cherry-Hooper schemes can pull up the high-frequency band and enlarge the bandwidth. The -3 db cutoff frequency of the proposed limiting amplifier is 6.7 GHz, and the voltage gain is 37 dB at a supply voltage of 1.8 V. The die size of the proposed optical receiver is 1,400 mum times 550 mum. As compared to the conventional work, the proposed optical receiver can have lower hardware cost at a similar receiving performance for 10 GB/s optical data communication
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